ramoneur, Check your math, I always used REM and never figured out the metric. but if you are saying you absorb 1230mS per year and have been doing this for a few years I think you would be turning pink.

Here is a good reference, it tops out at 1000ms which is when the victim starts to get sick.

"The corresponding annual effective dose, based on 700 hours of flight for subsonic aircraft and 300 hours for the Concorde, can be estimated at between 2 mSv for the least exposed routes and 5 mSv for the more exposed routes."

Ya, your arithmetic is ok but you are out by 1000, I think you get about 1.3 mS per year, which is not very much. The highest occupational dose is the space lab astronauts with is over 100 per year which is quite a lot, but they will never go up again.

I have read about radiation exposure from flying, and without verifying your data sources or analyzing the numbers, I choose to simply not worry about it. Flying on average about 55,000 miles/year, I am nothing like a true frequent flyer. The way I look at it is, if long haul flight crews aren't dying from it (prolonged exposure to cosmic radiation), then it's likely that I have nothing little to worry about.